Our argument has no holes
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1 Our argument has no holes And that means a real breathable building wrap
2 10 good reasons to specify or use Tyvek HomeWrap 12 Unlike other commonly used building wraps, Tyvek HomeWrap is not perforated with holes that can reduce the effectiveness of the wrap. The microfibrous, non-perforated structure of Tyvek HomeWrap allows walls to 3 breathe while providing a highly effective water barrier. Tyvek HomeWrap improves energy efficiency by protecting other insulation. Tyvek HomeWrap is light and easy to handle while exhibiting high strength and 5 4 durability characteristics. 2743mm (9 foot) and 3048mm (10 foot) wide rolls allow for one pass around a 6 building saving time and effort. Tyvek HomeWrap satisfies James Hardie vapour permeable membrane requirements to be an accepted breathable membrane behind James Hardie 7 external cladding 8 Tyvek HomeWrap is specified as the accepted building membrane in BORAL OutRWALL TM and BORAL FireClad Wall systems. 9 Tyvek HomeWrap is specified by Tillings Timbers as an acceptable building membrane behind their range of Western Red Cedar Timber Cladding. 10 Tyvek is a respected Global brand used in over 15 million buildings world wide. Fully complies with Australian standards for flexible building membranes.
3 A building membrane with real breathability An effective building wrap saves money in the long run and protects what is always a significant financial investment. A building membrane, installed under the outer cladding, should facilitate vapour permeability, allowing moisture to escape to aid in the prevention of mould and mildew. At the same time, it should form a protective skin against wind and rain to prevent costly water damage and provide a dry, comfortable, healthy and energy efficient living space. TYVEK HOMEWRAP THE HOLE STORY The difference between Tyvek HomeWrap and other commonly used building membranes is the absence of punched holes and perforations which can result in water leakage through the wrap. PERFORATED FOIL WRAP PERFORATED FILM WRAP TYVEK HOMEWRAP The continuous microfibre web in Tyvek HomeWrap has microscopic pores, large enough for vapour to pass through, but small enough to resist air and liquid water penetration. Other membranes rely on mechanical perforations and/or film laminations, which means either holes too small to allow moisture to escape or too large, allowing bulk water in.
4 ? So, why choose Tyvek HomeWrap BECAUSE IT WORKS DuPont created Tyvek HomeWrap to provide a balance of properties for superior performance against the elements and optimal protection against the effects of weather and the ingress of moisture. In simple terms this means letting the vapour out (breathability), resisting air infiltration and preventing water intrusion. BECAUSE IT PROTECTS YOU When it comes to the potential for future concerns about the integrity of the building and possible litigation, you can be confident that Tyvek HomeWrap provides the very best protection available. BECAUSE IT IS EASY TO USE Tyvek HomeWrap is lightweight, quick and easy to fix, yet extremely strong and durable. You ll be impressed with how convenient and effective it is to use as a building material and, of course, any time you save in wrapping and cladding is a major business and financial positive.
5 A more technical argument Not entirely convinced? The following, more detailed information may help you to make up your mind. DEFINING THE DIFFERENCE Perforated housewraps, which are marketed under various trade names, consist of two basic structures. Some are made from a coarse woven slit film backing. Because this backing is inherently poor at resisting air and water infiltration, it is coated with a thin fragile film layer. Others consist of a simple cross-laminated film structure with no backing material. The film portion of these products is strictly a vapour barrier, lacking the vapour permeability required in many modern wall systems. To try to meet specification requirements for vapour permeability, these products are micro-perforated or poked with thousands of holes. These perforations, or holes allow the product to pass or breathe a small amount of moisture vapour, reducing the effectiveness of the housewrap to resist air and water penetration. When it comes to perforated housewraps, there is always a trade off between air resistance, water resistance and moisture vapour permeability. DISCOVER THE TYVEK HOMEWRAP ADVANTAGE DuPont Tyvek HomeWrap is a non-woven, non-perforated sheet made by spinning extremely fine continuous high-density polyethylene (HDPE) fibres that are fused together to form a strong uniform web. DuPont Tyvek HomeWrap is a unique brand and the only product manufactured this way. This tough, durable and unique structure is not susceptible to the compromises of a perforated material. The fibrous structure is engineered to create millions of extremely small pores that resist bulk water and air penetration while allowing moisture vapour to pass through. DuPont Tyvek HomeWrap achieves the ultimate balance of weather resistance and vapour permeability.
6 PROTECTING YOUR WORKMANSHIP AND REPUTATION The building industry can face litigation for moisture related issues from a failure to design and build forgiving wall systems that can manage incidental moisture that enters a wall cavity. High bulk water resistance and high drying potential are key components of creating a well-built and forgiving wall system. DuPont Tyvek HomeWrap has a much higher resistance to bulk water penetration than perforated housewraps, helping to reduce the damaging effects of moisture build-up and protecting the integrity of your work; The ability of a housewrap to hold our bulk water is one of the most basic and important requirements of any weather resistant barrier. DuPont Tyvek HomeWrap has over 13 x Greater water holdout than perforated housewraps, as tested in accordance with the Hydrostatic Head Test (AATCC-127). Tyvek HomeWrap passed the high duty water holdout requirements ASNZ A wall wrap should have a high perm rating, so that the natural ability of a wall system to dry out is not impeded. The Moisture Vapour Transmission Rate (MVTR) of Tyvek HomeWrap is approximately 5 x greater than that of perforated housewraps (Figure 2). The punched holes only allow the perforated products to transmit moisture vapour in the locations of the holes while the rest of the surface area remains a vapour barrier. The increase moisture vapour permeability of Tyvek HomeWrap helps reduce wall cavity drying times, which decreases the potential for rot and harmful mould growth; Not only do perforated housewraps allow moisture to pass through, they also slow the drying process, because the product can only breathe at these specific locations. Tyvek HomeWrap has a high vapour transmission rate, as measured under ASNZS Tyvek HomeWrap has very low vapour barrier properties. Another basic function of a housewrap is to help insulation maintain its R-Value by keeping air from infiltrating the wall system. The ability of a weather resistant barrier in helping to prevent air infiltration directly relates to the energy costs of heating and cooling a home. Tyvek HomeWrap has much better air resistance than perforated housewraps, allowing insulation to maintain its effectiveness and energy costs to be lower; Tyvek HomeWrap has higher air resistance than perforated housewraps.
7 Simply put, it is easy to understand the performance differences between Tyvek HomeWrap and perforated housewraps. Tyvek HomeWrap provides builders with an easy solution to protecting the buildings they construct from the harmful effects of the elements. This is why thousands of builders world wide choose to use Tyvek HomeWrap over any other product. What can DuPont Tyvek HomeWrap do for you? INCREASED BUILDING DURABILITY: Installing DuPont Tyvek HomeWrap at the start of construction helps protect building materials from water penetration by keeping bulk water out and allowing smaller water vapour molecules to pass through. Decreasing exposure to the elements helps prevent the formation of mould and helps protect the structure from corrosion. BETTER ENERGY PERFORMANCE: Studies have shown that air leakage accounts for between 25% and 40% of the energy used for heating and cooling a typical residence. Many air leaks cannot be properly sealed after drywall is installed. DuPont Tyvek HomeWrap helps control the air coming into the building to preserve the R-Value of walls. A home wrapped in a DuPont Tyvek HomeWrap will maintain 94% of its installed R-Value, compared to only 37% for a home without Tyvek HomeWrap. Insulation can lose up to 63% of its installed R-value without using Dupont Tyvek HomeWrap. R VALUE PERFORMANCE R-VALUES AND TYVEK HOMEWRAP As Tyvek HomeWrap is not a thermal insulation material by itself but is used as an adjunct to insulation it complies with the requirements of the BCA by meeting the requirements of AS/NZS for pliable building membranes. Tyvek HomeWrap performs four useful functions in a wall system allowing for a more forgiving wall system. A) It helps maintain the efficiency of other insulation materials by keeping it dry and in situ B) It acts as a secondary weather resistant skin C) It allows any moisture that may ingress through the cladding or primary exterior to breathe out D) It stops the ingress of air movement through a wall When Tyvek HomeWrap is combined with R1.5 bulk insulation in a standard brick veneer wall, an R-value of 2.3 can be achieved. When Tyvek HomeWrap and R2.0 bulk insulation is installed behind James Hardie external cladding, a total R-Value of over 2.2 can be achieved. For further details visit and refer to James Hardie Wall System Thermal Performance Total R-Value Technical Supplement. When Tyvek HomeWrap s combined with Wren Industries Concertina Foil Batts TM in a standard brick veneer wall, an R-Value of 2.3 can be achieved. Tyvek HomeWrap should be installed in accordance with AS/NZ
8 Roll Length Roll Width Area Cover Weight 30m 2743mm 82m 2 5kg 30m 3048mm 91.4m 2 5.6kg PROPERTY DESCRIPTION TEST METHOD SPECIFICATION REQUIREMENT AWTA TEST RESULT Tensile Strength AS Machine Direction 4.6 KN/m Duty Heavy 12.5 Medium 9.5 Light 7.5 Extra Light 6.0 Lateral Direction 5.2 KN/m Duty Heavy 7.5 Medium 6.0 Light 4.5 Extra Light 3.5 Edge Tear Resistance TAPPI T470 Machine & Lateral Direction (MD) 225N Duty Extra Heavy 90 (LD) 216N Heavy 80 Medium 65 Light 45 Extra Light 30 Bursting Strength AS Light Duty 200N 225N Vapour Barrier ASTM E96 High Duty <0.00µg/N.s 1.8mg/N.S. Medium µg/N.s Low Duty >0.1400µg/N.s Unclassified Water Barrier AS1736 High Duty Shall Pass PASS (AS/NZS ) Absorbency AS/NZS High Duty >100/m 2 33g/m 2 Dry Delamination AS/NZS Shall Pass PASS Wet Delamination AS/NZS Shall Pass PASS Folding Endurance** AS Machine Direction 72.0 (log 100) >2.0 (log 100) Machine Direction 71.7 (log 50) >2.0 (log 100) Shrinkage AS1736 Not greater than 0.5% +0.3% (AS/NZS ) Flammability Index AS Not greater than 5 3 Emittance* ASTM E408 Reflective < (AS/NZS ) Classification value Non-reflective 1.00 * Test conducted by University of WA Dept of Mech and Materials Engineering ** Test conducted by CSIRO Division of Forestry and Forest Products TYVEK HOMEWRAP THE REAL BREATHABLE BUILDING MEMBRANE FOR INFORMATION ON A DISTRIBUTOR IN AUSTRALIA, TELEPHONE DUPONT AUSTRALIA LTD ON (02) OR IN NEW ZEALAND CALL DUPONT NEW ZEALAND ON (09) Tyvek HomeWrap passes AS/NZS 4200 Standard for Pliable Building Membranes. Tyvek HomeWrap should not be used under roofs. Due to the lightness of the product wind may cause excessive flapping and noise. Tyvek is not a vapour barrier. All weather guarantees: DuPont will replace any Tyvek wall membrane (not labour) that is torn off a wall due to normal weather conditions, provided: Tyvek has been fixed securely to frame using Teco foil fasteners (or equivalent) every 600mm horizontally and every 800mm vertically, or by using staples and strapping every 600mm. Winds do not exceed 120kph. Tyvek is enclosed with external cladding within 2 months. DuPont registered trademark. DuPont trademark A.C.N *All testing conducted by independent laboratory on commercially available rolls of DuPont TM Tyvek HomeWrap and perforated wraps. Copyright 2006 E.I. du Pont de Nemours and Company. All rights reserved. The DuPont Oval Logo, DuPont, The miracles of science, Tyvek and Tyvek HomeWrap are registered trademarks or trademarks of E.I. DuPont de Nemours and Company or its affiliates.
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